It makes assures that how many times variables and nets toggled? Toggle coverage could be as simple as the ratio of nodes toggled to the total number of nodes.

X or Z --> 1 or H
X or Z --> 0 or L
1 or H --> X or Z
0 or L --> X or Z

Above example shows the signal changes from one level to another. All types of transitions mentioned above are not interested. Only 1->0 and 0->1 are important. Toggle coverage will show which signal did not change the state. Toggle coverage will not consider zero-delay glitches. This is very useful in gate level simulation.

Toggle coverage report of the example:

Name Toggled 1->0 0->1
a No No Yes
b No No No
c No No No
d No No No
e No No No
f No No No

Asic Design
Bottle Neck In Asic Flow
Functional Verification Need
Linear Testbench
Linear Random Testbench
How To Check The Results
Self Checking Testbenchs
How To Get Scenarios Which We Never Thought
How To Check Whether The Testbench Has Satisfactorily Exercised The Design
Types Of Code Coverage
Statement Coverage
Block Coverage
Conditional Coverage
Branch Coverage
Path Coverage
Toggle Coverage
Fsm Coverage
Make Your Goal 100 Percent Code Coverage Nothing Less
Functional Coverage
Coverage Driven Constraint Random Verification Architecture
Phases Of Verification
Ones Counter Example
Verification Plan

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